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The use of 2FA is clearly irrelevant to the issue of NSA internet surveillance. If the traffic is encrypted (and they can't decrypt it), then the authentication mechanism is irrelevant. If the data is stored in the US, they have access to it via Lawful Intercept capabilities, and therefore the authentication mechanism is irrelevant.

Of course, one should use 2FA whenever available, but it has nothing to do with avoiding surveillance. Indeed, it creates a stronger link between an account and an identity, i.e. anonymous twitter account + 2FA w/ mobile phone number == not anonymous.

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